[patch] MdeModulePkg/HiiDB: Handle the "&READONLY" tag in <KeywordResp> correctly

[Dandan Bi <dandan.bi@intel.com>]

This patch is to fix the incorrect logic when handling the "&READONLY" tag
in <KeywordResp>.
1. In UEFI spec, the "&READONLY" tag is in upper case, but using the lower
case in current codes by mistake.
2. The logic in checking the ReadOnly flag is not correct. Whether having
"&READONLY" tag must be consistent with the result of
"ExtractReadOnlyFromOpCode" function.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
 .../Universal/HiiDatabaseDxe/ConfigKeywordHandler.c     | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/MdeModulePkg/Universal/HiiDatabaseDxe/ConfigKeywordHandler.c b/MdeModulePkg/Universal/HiiDatabaseDxe/ConfigKeywordHandler.c
index 6682319..10a901f 100644
--- a/MdeModulePkg/Universal/HiiDatabaseDxe/ConfigKeywordHandler.c
+++ b/MdeModulePkg/Universal/HiiDatabaseDxe/ConfigKeywordHandler.c
@@ -2905,15 +2905,15 @@ EfiConfigKeywordHandlerSetData (
       goto Done;
     }
     StringPtr = NextStringPtr;
 
     //
-    // 5. Find ReadOnly filter.
+    // 5. Find READONLY tag.
     //
-    if ((StringPtr != NULL) && StrnCmp (StringPtr, L"&ReadOnly", StrLen (L"&ReadOnly")) == 0) {
+    if ((StringPtr != NULL) && StrnCmp (StringPtr, L"&READONLY", StrLen (L"&READONLY")) == 0) {
       ReadOnly = TRUE;
-      StringPtr += StrLen (L"&ReadOnly");
+      StringPtr += StrLen (L"&READONLY");
     } else {
       ReadOnly = FALSE;
     }
 
     //
@@ -2935,13 +2935,22 @@ EfiConfigKeywordHandlerSetData (
 
     //
     // 8. Check the readonly flag.
     //
     if (ExtractReadOnlyFromOpCode (OpCode) != ReadOnly) {
+      //
+      // Extracting readonly flag form opcode and extracting "READONLY" tag form KeywordString should have the same results.
+      // If not, the input KeywordString must be incorrect, return the error status to caller.
+      //
+      *ProgressErr = KEYWORD_HANDLER_INCOMPATIBLE_VALUE_DETECTED;
+      Status = EFI_INVALID_PARAMETER;
+      goto Done;
+    }
+    if (ReadOnly) {
       *ProgressErr = KEYWORD_HANDLER_ACCESS_NOT_PERMITTED;
       Status = EFI_ACCESS_DENIED;
-      goto Done;      
+      goto Done;
     }
     
     //
     // 9. Merge to the MultiKeywordResp string.
     //
-- 
1.9.5.msysgit.1